Coordinates: 22°27′46″S 42°39′10″W / 22.46278°S 42.65278°W
Cachoeiras de Macacu (Portuguese pronunciation: [ˌkaʃuˈeɪɾai̯ʃ ˌdʒi.makaˈku]) is a municipality located in the Brazilian state of Rio de Janeiro. Its population was 53,765 (2005) and its area is 956 km².
The municipality contains part of the Central Rio de Janeiro Atlantic Forest Mosaic, created in 2006. It held 76% of the 4,920 hectares (12,200 acres) Paraíso Ecological Station, created in 1987 and now integrated into the Três Picos State Park. It contains 49% of the 46,350 hectares (114,500 acres) Três Picos State Park, created in 2002. It contains part of the 19,508 hectares (48,210 acres) Bacia do Rio Macacu Environmental Protection Area, created in 2002.